Hametsu no Mars, Pupa Recommendations
Both are insanely terrible "thriller" shows, in a way that it may be watched as comedy and provide much entertainment while watching with friends, only Pupa is more brutal. Be careful and watch with caution :)
Both are short and violent anime from the 21st century and have a very small soundtrack. They are also both in MAL's bottom 100.
Both, with intricate aesthetics and unexpected cruelty, spaning through exploding heads and gruesome teddy bears, rise profound ontological questions about human nature.